Rotary screen.



S. W. TRAYLOR. ROTARY SCREEN.

0 1 9 1 Q 1 W M d .m H w a P APPLICATION FILED D1 10.22, 1908.

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s. W. TRAYLOR..

ROTARY SCREEN, APPLICATION FILED DEC. 22, 1908.

Patented May 10, 1-910.

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' ROTARY SCREEN.

APPLICATION FILED DEG. 22, 1908. 186' Patented May 10, 1910.

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SAMUEL W. TRAYLOR, 0F ALLENTOWN, PENNSYEVANIA.

ROTARY soaiinn.

Specification of Letters Patent.

Patented May 10, 1910.

Application filed December 22, 1908. Serial No. 468,790.

To all whom it may concern:

Be it known that I, SAMUEL W. TRAYLOR, a citizen of the United States,residing at Allentown, Pennsylvania, have invented certain new anduseful Improvements in Rotary Screens, of which the following is aspecification.

My invention relates to improvements in rotary screens designed moreespecially for screening ores.

One object of the invention is to provide an exceedingly simple,economical, durable and efficient rotary screen, including in itsconstruct-ion a plurality of screen sections which may be readilysecured to the carry ing frame and as easily removed and replaced.

A further object is to provide efiicient means for spraying the internalsurfaces of the screen sections to free them from the material beingoperated upon so that the feed to the screen will continuously run on toa clean surface, thereby securing maximum efficiency.

I have also aimed to provide simple and eflicient valve mechanism forsecuring the automatic control of the water supply; and means forpreventing the clogging of the openings in the spray pipe.

With these and other objects in view, the invention comprises thevarious features of construction and arrangement and combination ofparts hereinafter described and particularly set forth in-the appendedclaims.

An embodiment of my invention is illustrated in the accompanyingdrawings in which,

Figure 1 is a plan view of the screen. Fig. 2 is a section on line 2-2of Fig. 1. Fig. 3 is a section on line 3-3 of Fig. 2. Fig. 1 is a detailview. Figs. 5, 6 and 7 are detail views of modifications.

Referring by reference characters to these figures, I have shown atlO,10 two chutes or distributers as representative of any suitable meansfor feeding the ore to be screens or separated, the chutes beingpreferably provided with fingers 10 to se cure the uniform feeding ordistributing of the ore. From these chutes the ore drops upon theexterior surface of a rotary screen 11 having a plurality of flat screenmembers or sidesas indicated at 12, eight of these members or sidesbeing shown as a convenient number, making the screen drum of octagonalform. This drum 1S rotatably mounted, in the manner hereinafter moreparticularly described, within a suitable casing 13, the lower part ofwhich is tapered or contracted as shown at 13 and which forms anoversize receiving hopper which discharges through the outlet opening 14at its lower end.

The drum comprises a conical central portion or member 15, side plates16, and transverse radial webs 17 connecting the side plates andextending inward to the cen' tral cone, these parts being convenientlymade of sheet metal with abutting flanges or portions riveted orotherwise suitably secured together. These radial webs, with the sideplates, provide a plurality of compartments, one for each screen, asindicated at 18 and each has a discharge opening 18 in the side plate atthe smaller end of the cone shaped member, communicating with adischarge hopper or collector 19.

As the material from the feed chutes falls on the screen surfaces, whichare successively presented in the rotation of the screen the undersizeor through product passes through each screen into the compartmentsbeneath and falling on the inclined surfaces of the central cone flowsoutwardly through the lateral opening into the discharge hopper orcollector 19.

By dividing up the interior of the drum into a plurality of compartmentsby the radial partitions, the undersize or through product is preventedfrom rolling directly around the cone 15 and thus dropping back again onto the inner surface of that portion of the rotary screen which is belowthe cone, it being confined against the cone by the radial walls thusdeveloped laterally out ward at the inclination of the cone before thatportion of the cone has reached an inverted position.

The oversize material, or that which does not pass through the screen,but remains on the outside surface, is carried over into the lowerportion of the casing or hopper where it tends to drop off, though moreor less of it will adhere to the surface of the screen.

To effccttally clear the meshes from this oversized material, means areprovided for spraying water against the inner surface of each screensection by the time it has reached the lower portion of the casing. Avery desirable means for accomplishing this is to provide a pipe 20extending longitudinally within each compartment 18 and provided 24,openings being provided through the shaft to the interior of the collar22 which is hollow and by:

which the water is enabled to pass to all of;

the spray pipes.

Eachbranch pipe 21 is:

provided with a valve indicated at 25, which is preferably a springseated valve of the plunger type designed to be normally closed I at alltimes except when the corresponding screen portion 1s in a position toreceive the i spray of water. At this time the stem of the plunger valveis designed to come in: contact with a stationary cam surface 26 whichpresses the valve stem in and admits b the water to the spray pipe, thecam surface being elongated sufficiently to keep the valve l open untilthe screen surface has been thoroughly sprayed. In order to prevent thei pipes from being clogged by the undersize provide in proximity toeaclr d or protector 27, which is pivmaterial, I pipe a shiel" otallymounted between the side plates 16 and is inai-nta in'ed bycounterweights 28 constantly directly over the spray pipes. Thus thepipes which are beneath the screen se'ct-ion's at the top of the drumare protected from the falling material while the open ings in the pipesabove the screens at the bot-tom of the drum are unobstructed and freeto discharge the wash water directly against the surface of the screens.

from one side of the screen,

ner I leave the central portion of the oppo- I si-teside entirelyunobstructed for the delivery of the undersize material. end the hollowshaft projects only from one side of the screen drum and easing where itis journaled in which the gear ceives its power counter-shaft 32carrying fast and loose pulleys 33 and 34.

To this the bearings 29, 29 between wheel 30 is located which rei from asmaller gear 31 on a I The screen surfaces 12 consist of woven wire ofthe proper mesh or size or any other form of screen carried by frames l2which rest against the ledges or flanges formed by I the angle barswhich latter are riveted to the inner faces of th edges of the radialpartitions.

e side plates and to the Over the meeting or abutting edges of theframes are placed angle bars 36 which are held in place by wedges orkeys 37 driven in between the lugs or the side angle bars near theirends and projections '38 on the inner faces of plates. By this means theframes I are firmly and securely held and yet may be readily removed forrepairs, and as readily replaced.

Instead of having a plurality of valves, operated at the proper time bya cam surface, I may provide a single valve construction foraccomplishing the same purpose, as shown in detail in Figs. 5, 6 and 7.In this construction, the spray water pipe 24, is led to the strainerbox 38 the outer screen shaft ing box 29", being provided to preventleak age. From this strainer box the water passes through the hollowcenter of the screen shaft around the solid central bar 35), theleft-hand end of which is of non-rotatable casting.

The right-hand end of the hollow shaft communicates with the valve box40 carried by the screen block, from which the pipes 21' radiate andconnect with the several spray pipes in the same manner as hereineforedescribed. \Vithi-n the valve box is located a valve block 41 detachablyheld in place by screws or other convenient fastening means, which blockhas ports 42 leading from the ends of the pipes 21 to the left-hand faceof the block, see Fig. (i. A valve plate 43 is non-rotatably carried bythe inner end of the rod 39, and has its face fitting snugly against theface of the valve block. This valve plate is provided with an arc-shapedport 44, and it will be seen that as the drum rotates carrying with itthe valve block, the passages 42 are brought successively intocommunication with the elongated arcshaped port 44, and thus the pipesare placed successively in communication. In this construction we preferto place bearing 29, a stuttthe fast and loose pulleys 3'3 and 34 on Iprefer to support the shaft entirely; as in this manthe screen shaft, asshown, to the drum by a double shown.

Having thus described my invention, what I claim is 1. A rotary screencomprising a conical center in the shape of a truncated cone, sideplates constituting heads, radial partitions joining said cone and sideplates and providing compartments, screen frames covering saidcompartments, a supporting shaft projecting from the larger end of theconical center, the side plate at the opposite end ha ving a deliveryopening for each compartment, a spray pipe within each compartment fordirecting a spray of water toward the screen surface, and means forsuccessively admitting water to said pipes, and cutting it off therefromas the screen rotates, substantially as described.

2. A rotary screen drum having a plurality of compartments with inclinedbottoms having deliveryopenings at one side, a suppor'tingshaft suitabl1 journaled and projecting from the opposite side, and hollow andconnect them reducing gear, as

made integral with throughout part of its length, a spray pipe wlthmeach compartment for directing a spray against the surface of thescreen, said pipes being in communication with said hollow shaft, meansfor automatically controlling said communication as the drum rotates,and a Water supply pipe connected with said hollow shaft, substantiallyas de-e scribed.

3. In combination a suitable casing, a screen drum rotatably mountedtherein, means for feeding ore onto the exterior of said drum at theupper side, means for of fecting the delivery of the under size materialfrom the interior of the drum, a plurality of water spray pipes withinsaid drum and carried thereby, and means for successively admittingwater to said pipes and out ting it 013" therefrom as the drum rotates,substantially as described.

4. In combination, a suitable casing, a

screen drum rotatably mounted therein, means for feeding the material tobe separated onto the upper side of said drum, means for effecting thedelivery of the under-sized material from the interior of the drum, aplurality of spray pipes within the drum and carried thereby havingspray openings facing the inside of the screen su face, means forautomatically controlling the flow of Water to the pipes as the drum rotates, and means for protecting the pipes from under sized material whenwater is not flowing therethrough, substantially as de scribed.

5. I11 combination, a suitable casing, a screen drum, rotatably mountedtherein, means for feeding the material to be separated onto the upperside of said drum, means for effecting the delivery of the undersizedmaterial from the interior of the drum, a plurality of spray pipesWithin the drum and carried thereby having spray openings facing theinside of the screen surface, means for automatically controlling theflow of Water to the pipes as the drum rotates, a protecting shieldlocated in proximity to each pipe, and a counterweight for holding saidshield at all times vertically over said pipe, substantially asdescribed.

6. In combination, a screen drum, a plurality of spray pipes, a rotarybox with which said pipes communicate, a valve block within the boxhaving a plurality of pas sages in communication pipes, a non-rotatablevalve plate having an elongated port cooperating successively with saidpassages, and means for admitting Water to the valve box, substantiallyas described.

In testimony whereof, I affix my signature in presence of two witnesses.

SAMUEL W. TRAYLOR. Witnesses MYLES A. WALSH, B. Wa flnAYLoR.

with said spray

